26448-34-0

Upstream product

• 22250-72-2 7,8-Dibromobicyclo<4.2.0>octa-1,3,5-trien 

Downstream Products

• 787-26-8 5,6-dibromobenzobiphenylene 
• 107369-38-0 7,12-diphenylacenaphtho<1,2-b>biphenylene 
• 107369-39-1 8,13-dibromo-7,14-diphenylbenzoacenaphtho<1,2-e>cyclo-octene 
• 107369-36-8 1-methyl-2,3,4-triphenylbiphenylene 
• 107369-37-9 2,3-dimethyl-1,4-diphenylbiphenylene 
• 107369-33-5 7-benzoylbenzobiphenylene 
• 107369-35-7 1,2,3,4-tetraphenylbiphenylene 
• 128174-79-8 2-(4-bromophenyl)-1(2H)-phthalazinone 

Relevant academic research and scientific papers

How aromatic are the benzene rings in biphenylene? The synthesis and NMR properties of a biphenyleno fused dihydropyrene

The synthesis of the biphenylene fused dihydropyrene 2 is described by cycloaddition of dibromobenzo-cyclobutadiene with the oxa[17]annulene 3 and deoxygenation of the adduct with Ti(0). Analysis of the NMR data indicates that biphenylene has about 55% of the relative bond fixing ability of benzene, which is equated to relative aromaticity. The experimentally determined Dewar resonance energy is 1.59 times that of benzene, while Dewar calculates 1.55 times benzene.

Benzocyclobutenes Part 8. Geometrical Isomerism of Arylhydrazones of Benzocyclobutene-1,2-dione

Four mono(arylhydrazone)s of benzocyclobutene-1,2-dione (BBD) have been prepared in which the aryl group is 2,4-dinitrophenyl, 4-bromophenyl, phenyl, and 4-nitrophenyl.The first three have been separated into their E- nd Z-isomers whose configurations are assigned on the basis of spectra and Rf values.Improvements in the preparation of BBD from 1,2-dibromo-1,2-dihydrobenzocyclobutene are described.